FR2567774A1 - CENTRIFUGE TO CLARIFY OR SEPARATE SUSPENSIONS - Google Patents

Abstract

THE CENTRIFUGE INCLUDES A CENTRIFUGAL BASKET, WHICH CONSISTS OF A BASKET LOWER PART 1, OF A BASKET LID 2, AND OF A CLOSING RING 3 ASSEMBLING THESE TWO PARTS ONE TO THE OTHER. THE CENTRIFUGAL BASKET IS ALSO EQUIPPED WITH AN INLET CHAMBER 17 FOR A SUSPENSION TO BE SEPARATED IN LIQUID PHASES AND A PART OF SOLID MATERIALS, WHICH IS PROVIDED THROUGH A DISTRIBUTOR TO A STACK OF DISCS WITH COLUMNS UPRIGHTS 13 PLACED INSIDE. THERE IS PROVIDED IN DISTRIBUTOR 10, BELOW EACH INTERIOR RISING COLUMN 13, A BYPASS CHAMBER 19 CONNECTED TO THE ADMISSION CHAMBER BY A DUCT 18, AND WHICH IS EQUIPPED AT THE LEVEL OF BYPASS SURFACE 20, WITH ' AT LEAST ONE 21 GAUGE ORIFICE. A FLOW OF PRODUCT WITH A HIGH CONTENT OF SOLIDS IS DERIVED THROUGH THESE 21 GAUGE ORIFICES, AND PROVIDE OTHER RISING COLUMNS 14 PLACED OUTSIDE OF A LOWER SECTION 12 OF THE STACKING OF DISCS. THE REST OF THE PRODUCT FLOW IS, THROUGH TUBING 24, PROVIDED FROM THE BYPASS CHAMBER 19 TO THE INSIDE RISING COLUMNS 13 OF THE UPPER SECTION OF THE DISC STACK.

Description

CENTRIFUGE TO CLARIFY OR SEPARATE

SUSPENSIONS

  The invention relates to a centrifuge for

  parry or clarify suspensions, with a central basket

  trifuge which comprises a lower basket portion, a basket lid and a closure ring assembling these parts, and which is provided with an admission chamber

  for suspension and a distributor, through

  the suspension can be brought to a stack

  of discs consisting of conical discs and

  equipped with risers placed inside.

  It is known from the German patent application

  DE-28 45 733 a centrifuge of this type, where the suspension

  sion is fed from the inlet chamber to a sedimentation chamber. The part of the suspension that is

  not collected by this chamber is directed, by

  bulures fixed in the dispenser, in columns

  inside rising of the stack of disks. The room

  of sedimentation presents in its bottom a crack which

  can be closed by a flexible ring. The central basket

  trifuge is equipped, at the level of its largest diameter,

  sludge outlets, which can be

  by means of a sliding bottom operated by a

  closing. When the sliding bottom is placed in the closed position, the bottom slot is closed by the flexible ring under the influence of the pressures acting on the latter. If the sliding bottom is moved to the open position to eject the sludge, the slot

  the bottom of the sedimentation chamber is also

  green, so that the solids accumulated there are expelled. Only coarse-grained solids accumulate in the sedimentation chamber, while the remainder of the solids-containing product stream flows through the columns.

  inside rising of the stack of disks.

  The separation zone of the liquid phases of the suspension is at the level of rising Alonnes. The separation of the liquid phases is carried out with ejection

  simultaneous centrifugation of the solid particles.

  In order to keep in the centrifugal basket a

  maximum power of clarification,

  very small valleys between the different disks of the disk stack. With some types of solids, this leads to clogging of the risers, as well as

  only slots defined by the disks.

  The object of the invention is to configure a centrifuge of the type mentioned in the introduction so as to be able to process even suspensions having a relatively high content of solid particles, as well as

  suspensions comprising coarse-grained solid particles.

  According to the invention, this objective is achieved by

  that it is planned in the distributor, below the colon-

  uprising placed inside, a chamber of

  connected to the inlet chamber by a conduit, and which has, at the bypass surface, at least one orifice calibrated to separate a portion of the slurry containing solids, that the stack of discs consists of 'an upper section and a

  lower section, the lower section being provided with

  upward rising columns, to which

  the is brought the partial partial flow of suspension, and that

  tubings start from the bypass chamber, tubular

  lures that open into the interior rising

  of the upper section of the disk stack, and which introduce the remaining part of the flow of suspension

  in the inner risers.

  With the centrifuge according to the invention, it is

  in the diversion chambers a division of the

  flow of product in two streams with different levels of

  in solids. The product stream is subjected in the bypass chambers to a cyclone effect, where the heavier and coarser solid particles are expelled through orifices calibrated together with a portion of a liquid, and fed to the other columns.

  mounted outside the stack of disks

  c. In the centrifugal field more powerful o are located

  these other rising columns, the separation of these

  solid materials is better, which avoids clogging of the risers. In addition, the risk of clogging in the lower section of the stack

  of discs can be fought by choosing in the sec-

  smaller intervals between two

  neighbors, and therefore a larger slot width.

  The centrifuge according to the invention can be

  advantageously bent for the skimming of whey; in fact, the small cheese contains a caseous part which, with the centrifuges employed hitherto, resulted in

  clogging up risers and slits

views between the disks.

  The following description describes the invention in

  detail with the help of an exemplary embodiment represented in

  cut on the single figure of the appended drawing.

  Centrifugal basket of a self-contained centrifuge

  drainable valve shown in the figure comprises a bottom portion (1) basket, a basket lid (2), and

  a shutter ring (3) which assembles these two parts.

  The centrifuge chamber (1) of the central basket

  trifuge consists of a separation chamber (5) and a solids chamber (6). The room

  solids is bounded, downwards, by a

  thrust chamber (7) which, by its axial displacements, allows or prohibits the passage of solids by

  expulsion orifices (8) arranged in a horizontal plane

  zontal in the lower part (1) of the basket. A room

  (9) is assigned to the distributor at

  (7); this chamber is fed with liquid iron

  in order to move the slide valve into position

  closing procedure, and it can operate in the ad-

  mission as in evacuation mode.

  In the separation chamber, a stack of discs is arranged which consists of conical discs stacked one above the other, two discs

  neighbors being separated by a slot in which

  kills a separation of the liquid phases of the product fed, with simultaneous expulsion by centrifugation of the solids.

  Stacking of disks is based on a distribution

  tor (10), which has a lower part of co-form

corresponding number.

  The stack of disks is broken down into an upper section (11) and a lower section (12). The upper section of the disk stack is exclusively equipped

  risers (13) located inside and distributing

  the lower section (12) has other risers (14), located outside and distributed around the perimeter. The separation between the two sections is provided by the lower disk (15) of the upper section (11). This disc (15) closes the risers (14), which are formed by holes (16) formed in the discs of the section

lower (12).

  The suspension that is to be separated in the centrifuge is fed to an inlet chamber (17) of the distributor (10), and flows through conduits (18) into bypass chambers (19). Under each inner riser (13) there is disposed a bypass chamber (19) in which the suspension is subjected.

  to a cyclone effect. The bypass chamber (19) pre-

  a branch surface (20) at the level of

  which is provided at least one calibrated orifice (21) intended

  to separate a part of the suspension containing

  solid substances. In the exemplary embodiment shown, the calibrated orifice (21) is in a threaded bush (23) screwed into a tapping (22) of the distributor. The diameter of the calibrated orifice is chosen according to the grain size of the solid particles which must

  be separated from the suspension. The choice of standard orifices

  adequate flow determines both the partial flow of product that is derived from the initial flow of product into the chamber

  bypass and is fed to the other risers

  and (14) disposed externally, that the product flow is fed to the inner risers (13) of the upper section (11) of the disk stack. Interchangeability of threaded bushings (23)

  makes it easy to adapt the centrifugal basket to

  specificities of the product to be treated.

  The by-product flow in the bypass chambers (19) through the calibrated orifices (21), which is fed to the other external risers (14) of

  the lower section (12) of the stack of disks,

  has a high solids content, and is exposed to greater centrifugal forces, so that an intensive separation of the particles occurs.

  solid, without the risk of congestion

  rising lanes (14) or slots defined by

the disks.

  In order to further reduce the risk of clogging in the lower section of the stack of discs, it is possible to provide a gap width between them.

  different discs larger than in the upper section

  (11) of the stack of disks.

  The flow of product having a low solids content, which has not been deflected by the calibrated orifices (21), is led, via tubings (24), to

  bypass chambers (19) with integral risers

  (13) of the upper section (11) of the disk stack. The longitudinal axis (25) of each tubulure

  (24) is in alignment with the longitudinal axis of the

  corresponding rising bar (13), and extends parallel-

  to the axis of rotation (26) of the centrifugal basket.

  The figure shows that an acute angle is formed

  the longitudinal axis (25) and the longitudinal axis (27) of the duct (18); this angle is given a value such that the flow of product flowing from the inlet chamber (17) into the bypass chamber (19) is strongly

  deviated, in order to obtain an intensive cyclone effect.

  The tubings (24) arranged in the distribution

  (10) are interchangeable, so

  again here of a possibility of adaptation to particles

larities of the product to be treated.

  The product flow brought by the calibrated orifices

  brés is directed to the risers (14) by

  ribs (28). These ribs (28) guarantee a flow

  optimum product output from the calibrated orifice to the column

  uplink. The ribs extend only to the

  swimming up the riser (14). They are followed by a

  non-ribbed space below the base of the dispenser.

  A plug is formed in this non-ribbed space; this boulevard

  prevents the flow of product from being brought under the dispenser base to the material chamber

solids (6).

  For certain products, it has been found that in known centrifugal baskets the simultaneous operation

  liquid phase separation and centrifugal expulsion

  solid trifugation was causing difficulties

  because of the clogging of the stack of disks;

  In such cases, two baskets were used in series.

  differently equipped trifuges, which led to an increase in

  costing. The invention makes it possible to perform the

  separation of the liquid phases from the suspension and the ex-

  centrifugation of solids with a single centrifugal basket, even for problematic liquids.

Claims (4)

  1 - Centrifuge for separating or clarifying suspensions, with a centrifugal basket having a lower basket portion, a basket lid and a closure ring assembling these parts, and which is provided with an intake chamber for the suspension and   distributor, through which the suspension   sion can be brought to a stack of discs consisting of conical discs and provided with risers placed inside, characterized in that it is provided in the distributor (10), below each column   mounted inside (13), a distillation chamber   connected to the inlet chamber (17) by a conduit (18), and which has, at the bypass surface (20), at least one calibrated orifice (21) for separating part of the suspension containing solids, in that the disk stack consists of an upper section (11) and a lower section (12), the lower section being provided with other risers (14) arranged at outside, to which is brought the partial partial flow of suspension, and in that tubings (24) leave the bypass chamber (19), pipes that open into the risers   (13) of the upper section (11) of the   discs, and which introduce the remaining part   of the suspension flow in the interior risers res (13).   2 - Centrifuge according to claim 1, characterized   characterized in that the calibrated orifice (21) is practiced in   a threaded socket (23) interchangeable.   3 - Centrifuge according to claim 1, characterized   characterized in that the tubings (24) arranged in the   distributor (10) are interchangeable.   4 - Centrifuge according to any one of the   Claims 1 to 3, characterized in that, to bring the flow of product from the calibrated orifices (21) to the columns   rising (14), ribs (28) have been arranged.   Centrifuge according to claim 4, characterized in that the ribs (28) extend from the calibrated orifices (21) to the vicinity of the risers (14). 6 - Centrifuge according to any one of claims 1 to 5, characterized in that the width of   slit between the different disks of the lower section   re (12) of the stack of disks is greater than the   slit between the different discs of the section superior (11).